Figure 5.

Analyses of bipartition spectra for 12 genomes of marine picocyanobacteria. (a) Out of 2,037 bipartitions, 155 were found to be supported with 70% or higher bootstrap
values. Percentage values indicate the proportion of gene families that support each
consensus bipartition. Only nine consensus bipartitions were found with the Condense
software. These bipartitions, represented by orange stars and numbered from 1 to 9,
do not conflict with one another and can be combined in a single consensus tree that
has the same topology as the tree of core proteins (Figure 4a) except for the position
of Prochlorococcus sp. MIT9313. Some consensus bipartitions are supported by a low percentage of gene
families. This is likely an effect of the rapid divergence between marine Synechococcus and Prochlorococcus leading to very small internal branches in phylogenetic trees. (b) Modified Lento plot for bipartitions with at least 70% bootstrap support. For each
bipartition (numbered from 1 to 9), positive values on the y axis give the number
of gene families that support the bipartition for a given bootstrap value (color coded).
Negative values give the number of families that conflict with this bipartition. A
given gene family can conflict with several bipartitions.